After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and tribes, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;
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Bede
AD 735
multitude: On the conclusion of the recapitulation, which had been interposed for the sake of example, he returns to the previous order, and announces the glory of those who are to overcome the wickedness of the last persecution. And that which follows, "From all nations, and tribes, and peoples and tongues," may also be thus understood, that, after enumerating the tribes of Israel, to whom the Gospel was first preached, he desires to make mention of the salvation of the Gentiles as well.
robes: By "robes" he signifies baptism, by "palms" the triumph of the Cross, and he intimates that in Christ they have overcome the world. But robes may also double the glory which is given by the Holy Spirit. <a
And he said unto me, These are they who have come out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb. Therefore are they before the throne of God, and serve Him day and night in His temple.".
They shall neither hunger nor thirst ever; and neither shall the sun fall upon them, nor shall they suffer any heat: for the Lamb who is in the midst of the throne shall protect them, and shall lead them to the fountains of the waters of life; and God shall wipe away every tear from their eyes."
What the great multitude out of every tribe implies, is to show the number of the elect out of all believers, who, being cleansed by baptism in the blood of the Lamb, have made their robes white, keeping the grace which they have received.